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图表x轴显示优化

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hsc
2026-07-17 09:51:11 +08:00
parent 74d544c288
commit c4ec348217
2 changed files with 13 additions and 14 deletions
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20
MonitorModule/ViewModels/MonitorViewModel.cs
View File

@@ -222,10 +222,8 @@ namespace MonitorModule.ViewModels
if (channel == null) return; if (channel == null) return;
double time = _stopwatch.Elapsed.TotalSeconds;
// 记录数据点（线程安全：Record 内部 ConcurrentQueue + Series 操作） // 记录数据点（线程安全：Record 内部 ConcurrentQueue + Series 操作）
channel.Record(time, args.Value); channel.Record(args.Time, args.Value);
// 入队数据库批量写入 // 入队数据库批量写入
// CreateTime 使用 args.Time（采样触发时刻），而不是 DateTime.Now（设备响应到达时刻）， // CreateTime 使用 args.Time（采样触发时刻），而不是 DateTime.Now（设备响应到达时刻），
@@ -252,13 +250,12 @@ namespace MonitorModule.ViewModels
{ {
if (!_stopwatch.IsRunning) return; if (!_stopwatch.IsRunning) return;
double elapsed = _stopwatch.Elapsed.TotalSeconds; var now = DateTime.Now;
var xAxis = Plot.Axes.FirstOrDefault(a => a.Position == AxisPosition.Bottom); var xAxis = Plot.Axes.FirstOrDefault(a => a.Position == AxisPosition.Bottom);
if (xAxis != null) if (xAxis != null)
{ {
double window = 10000 * 0.1; // 20s 视窗 xAxis.Minimum = DateTimeAxis.ToDouble(now.AddSeconds(-20));
xAxis.Minimum = Math.Max(0, elapsed - window); xAxis.Maximum = DateTimeAxis.ToDouble(now.AddSeconds(0.5));
xAxis.Maximum = elapsed + 0.5;
} }
Plot.InvalidatePlot(true); Plot.InvalidatePlot(true);
} }
@@ -370,10 +367,11 @@ namespace MonitorModule.ViewModels
PlotAreaBorderColor = OxyColors.LightGray, PlotAreaBorderColor = OxyColors.LightGray,
Background = OxyColors.White Background = OxyColors.White
}; };
pm.Axes.Add(new LinearAxis pm.Axes.Add(new DateTimeAxis
{ {
Position = AxisPosition.Bottom, Position = AxisPosition.Bottom,
Title = "时间 (s)", Title = "时间",
StringFormat = "HH:mm:ss",
MajorGridlineStyle = LineStyle.Dot, MajorGridlineStyle = LineStyle.Dot,
MinorGridlineStyle = LineStyle.None MinorGridlineStyle = LineStyle.None
}); });
@@ -822,7 +820,7 @@ namespace MonitorModule.ViewModels
var recent = channel.DataPoints.ToArray(); var recent = channel.DataPoints.ToArray();
var startIdx = Math.Max(0, recent.Length - 10000); var startIdx = Math.Max(0, recent.Length - 10000);
for (int i = startIdx; i < recent.Length; i++) for (int i = startIdx; i < recent.Length; i++)
channel.Series.Points.Add(new DataPoint(recent[i].Time, recent[i].DisplayValue)); channel.Series.Points.Add(new DataPoint(recent[i].Time.ToOADate(), recent[i].DisplayValue));
Plot.Series.Add(channel.Series); Plot.Series.Add(channel.Series);
Plot.InvalidatePlot(true); Plot.InvalidatePlot(true);
@@ -846,7 +844,7 @@ namespace MonitorModule.ViewModels
channel.Series.Points.Clear(); channel.Series.Points.Clear();
var startIdx = Math.Max(0, points.Length - 10000); var startIdx = Math.Max(0, points.Length - 10000);
for (int i = startIdx; i < points.Length; i++) for (int i = startIdx; i < points.Length; i++)
channel.Series.Points.Add(new DataPoint(points[i].Time, points[i].DisplayValue)); channel.Series.Points.Add(new DataPoint(points[i].Time.ToOADate(), points[i].DisplayValue));
Plot.InvalidatePlot(true); Plot.InvalidatePlot(true);
} }
#endregion #endregion

7
UIShare/UIViewModel/MonitorChannel.cs
View File

@@ -1,5 +1,6 @@
using OxyPlot.Series; using OxyPlot.Series;
using OxyPlot; using OxyPlot;
using System;
using System.Collections.Concurrent; using System.Collections.Concurrent;
using Prism.Mvvm; using Prism.Mvvm;
using NCalc; using NCalc;
@@ -52,7 +53,7 @@ namespace UIShare.UIViewModel
// ===== 数据存储 ===== // ===== 数据存储 =====
/// <summary>所有采样数据点（线程安全），与 OxyPlot 无关</summary> /// <summary>所有采样数据点（线程安全），与 OxyPlot 无关</summary>
public ConcurrentQueue<(double Time, double RawValue, double DisplayValue)> DataPoints { get; } = new(); public ConcurrentQueue<(DateTime Time, double RawValue, double DisplayValue)> DataPoints { get; } = new();
/// <summary>最大缓冲数据点数，超出则丢弃最旧的</summary> /// <summary>最大缓冲数据点数，超出则丢弃最旧的</summary>
public int MaxBuffer { get; set; } = 5000; public int MaxBuffer { get; set; } = 5000;
@@ -67,7 +68,7 @@ namespace UIShare.UIViewModel
// ===== 辅助方法 ===== // ===== 辅助方法 =====
/// <summary>记录一个数据点：RawValue 经数学变换后得到 DisplayValue，一并入队</summary> /// <summary>记录一个数据点：RawValue 经数学变换后得到 DisplayValue，一并入队</summary>
public void Record(double time, double rawValue) public void Record(DateTime time, double rawValue)
{ {
double displayValue = rawValue; double displayValue = rawValue;
@@ -82,7 +83,7 @@ namespace UIShare.UIViewModel
// 如果正在显示，同步到 Series // 如果正在显示，同步到 Series
if (_series != null) if (_series != null)
{ {
_series.Points.Add(new DataPoint(time, displayValue)); _series.Points.Add(new DataPoint(time.ToOADate(), displayValue));
while (_series.Points.Count > 10000) while (_series.Points.Count > 10000)
{ {
_series.Points.RemoveAt(0); _series.Points.RemoveAt(0);